<template>
  <div :class="wrapClasses" :style="styles">
    <div :class="classes">
      <div :class="[prefixCls + '-title']" v-if="showSlotHeader" ref="title">
        <slot name="header"></slot>
      </div>
      <div :class="[prefixCls + '-header']" v-if="showHeader" ref="header" @mousewheel="handleMouseWheel">
        <oolongTableHead
          :prefix-cls="prefixCls"
          :styleObject="tableHeaderStyle"
          :columns="cloneColumns"
          :column-rows="columnRows"
          :obj-data="objData"
          :columns-width="columnsWidth"
          :data="rebuildData"></oolongTableHead>
      </div>
      <div :class="[prefixCls + '-body']" :style="bodyStyle" ref="body" @scroll="handleBodyScroll"
           v-show="!((!!localeNoDataText && (!data || data.length === 0)) || (!!localeNoFilteredDataText && (!rebuildData || rebuildData.length === 0)))">
        <oolongTableBody
          ref="tbody"
          :prefix-cls="prefixCls"
          :styleObject="tableStyle"
          :columns="cloneColumns"
          :data="rebuildData"
          :columns-width="columnsWidth"
          :obj-data="objData"></oolongTableBody>
      </div>
      <div
        :class="[prefixCls + '-tip']" :style="bodyStyle" @scroll="handleBodyScroll"
        v-show="((!!localeNoDataText && (!data || data.length === 0)) || (!!localeNoFilteredDataText && (!rebuildData || rebuildData.length === 0)))">
        <table cellspacing="0" cellpadding="0" border="0">
          <tbody>
          <tr>
            <td :style="{'height':bodyStyle.height,'width':`${this.headerWidth}px`}">
              <span v-html="localeNoDataText" v-if="!data || data.length === 0"></span>
              <span v-html="localeNoFilteredDataText" v-else></span>
            </td>
          </tr>
          </tbody>
        </table>
      </div>
      <div :class="[prefixCls + '-fixed']" :style="fixedTableStyle" v-if="isLeftFixed">
        <div :class="fixedHeaderClasses" v-if="showHeader">
          <oolongTableHead
            fixed="left"
            :prefix-cls="prefixCls"
            :styleObject="fixedTableStyle"
            :columns="leftFixedColumns"
            :column-rows="columnRows"
            :fixed-column-rows="leftFixedColumnRows"
            :obj-data="objData"
            :columns-width="columnsWidth"
            :data="rebuildData"></oolongTableHead>
        </div>
        <div :class="[prefixCls + '-fixed-body']" :style="fixedBodyStyle" ref="fixedBody"
             @mousewheel="handleFixedMousewheel" @DOMMouseScroll="handleFixedMousewheel">
          <oolongTableBody
            fixed="left"
            :prefix-cls="prefixCls"
            :styleObject="fixedTableStyle"
            :columns="leftFixedColumns"
            :data="rebuildData"
            :columns-width="columnsWidth"
            :obj-data="objData"></oolongTableBody>
        </div>
      </div>
      <div :class="[prefixCls + '-fixed-right']" :style="fixedRightTableStyle" v-if="isRightFixed">
        <div :class="fixedHeaderClasses" v-if="showHeader">
          <oolongTableHead
            fixed="right"
            :prefix-cls="prefixCls"
            :styleObject="fixedRightTableStyle"
            :columns="rightFixedColumns"
            :column-rows="columnRows"
            :fixed-column-rows="rightFixedColumnRows"
            :obj-data="objData"
            :columns-width="columnsWidth"
            :data="rebuildData"></oolongTableHead>
        </div>
        <div :class="[prefixCls + '-fixed-body']" :style="fixedBodyStyle" ref="fixedRightBody"
             @mousewheel="handleFixedMousewheel" @DOMMouseScroll="handleFixedMousewheel">
          <oolongTableBody
            fixed="right"
            :prefix-cls="prefixCls"
            :styleObject="fixedRightTableStyle"
            :columns="rightFixedColumns"
            :data="rebuildData"
            :columns-width="columnsWidth"
            :obj-data="objData"></oolongTableBody>
        </div>
      </div>
      <div :class="[prefixCls + '-fixed-right-header']" :style="fixedRightHeaderStyle" v-if="isRightFixed"></div>
      <div :class="[prefixCls + '-footer']" v-if="showSlotFooter" ref="footer">
        <slot name="footer"></slot>
      </div>
    </div>
    <oolongSpin fix size="large" v-if="loading">
      <slot name="loading"></slot>
    </oolongSpin>
  </div>
</template>
<script>
import oolongTableHead from './oolong-table-head.vue';
import oolongTableBody from './oolong-table-body.vue';
import oolongSpin from '../spin';
import {deepCopy, getScrollBarSize, getStyle, oneOf} from '../../utils/assist';
import {off, on} from '../../utils/dom';
import Csv from '../../utils/csv';
import ExportCsv from './export-csv';
import Locale from '../../mixins/locale';
import elementResizeDetectorMaker from 'element-resize-detector';
import {convertColumnOrder, convertToRows, getAllColumns, getRandomStr} from './util';

const prefixCls = 'oolong-table';

let rowKey = 1;
let columnKey = 1;
export default {
  name: 'oolongTable',
  mixins: [Locale],
  components: {oolongTableHead, oolongTableBody, oolongSpin},
  props: {
    data: {
      type: Array,
      default() {
        return [];
      }
    },
    columns: {
      type: Array,
      default() {
        return [];
      }
    },
    size: {
      validator(value) {
        return oneOf(value, ['small', 'large', 'default']);
      }
    },
    width: {
      type: [Number, String]
    },
    height: {
      type: [Number, String]
    },
    stripe: {
      type: Boolean,
      default: false
    },
    border: {
      type: Boolean,
      default: false
    },
    showHeader: {
      type: Boolean,
      default: true
    },
    highlightRow: {
      type: Boolean,
      default: false
    },
    rowClassName: {
      type: Function,
      default() {
        return '';
      }
    },
    context: {
      type: Object
    },
    noDataText: {
      type: String
    },
    noFilteredDataText: {
      type: String
    },
    disabledHover: {
      type: Boolean
    },
    loading: {
      type: Boolean,
      default: false
    }
  },
  data() {
    const colsWithId = this.makeColumnsId(this.columns);
    return {
      ready: false,
      tableWidth: 0,
      columnsWidth: {},
      prefixCls: prefixCls,
      compiledUids: [],
      objData: this.makeObjData(), // checkbox or highlight-row
      rebuildData: [], // for sort or filter
      cloneColumns: this.makeColumns(colsWithId),
      columnRows: this.makeColumnRows(false, colsWithId),
      leftFixedColumnRows: this.makeColumnRows('left', colsWithId),
      rightFixedColumnRows: this.makeColumnRows('right', colsWithId),
      allColumns: getAllColumns(colsWithId), // for multiple table-head, get columns that have no children
      showSlotHeader: true,
      showSlotFooter: true,
      bodyHeight: 0,
      scrollBarWidth: getScrollBarSize(),
      currentContext: this.context,
      cloneData: deepCopy(this.data), // when Cell has a button to delete row data, clickCurrentRow will throw an error, so clone a data
      showVerticalScrollBar: false,
      showHorizontalScrollBar: false,
      headerWidth: 0,
      headerHeight: 0
    };
  },
  computed: {
    localeNoDataText() {
      if (this.noDataText === undefined) {
        return this.t('i.table.noDataText');
      } else {
        return this.noDataText;
      }
    },
    localeNoFilteredDataText() {
      if (this.noFilteredDataText === undefined) {
        return this.t('i.table.noFilteredDataText');
      } else {
        return this.noFilteredDataText;
      }
    },
    wrapClasses() {
      return [
        `${prefixCls}-wrapper`,
        {
          [`${prefixCls}-hide`]: !this.ready,
          [`${prefixCls}-with-header`]: this.showSlotHeader,
          [`${prefixCls}-with-footer`]: this.showSlotFooter
        }
      ];
    },
    classes() {
      return [
        `${prefixCls}`,
        {
          [`${prefixCls}-${this.size}`]: !!this.size,
          [`${prefixCls}-border`]: this.border,
          [`${prefixCls}-stripe`]: this.stripe,
          [`${prefixCls}-with-fixed-top`]: !!this.height
        }
      ];
    },
    fixedHeaderClasses() {
      return [
        `${prefixCls}-fixed-header`,
        {
          [`${prefixCls}-fixed-header-with-empty`]: !this.rebuildData.length
        }
      ];
    },
    styles() {
      let style = {};
      if (this.height) {
        const height = parseInt(this.height);
        style.height = `${height}px`;
      }
      if (this.width) style.width = `${this.width}px`;
      return style;
    },
    tableStyle() {
      let style = {};
      if (this.tableWidth !== 0) {
        let width = '';
        if (this.bodyHeight === 0) {
          width = this.tableWidth;
        } else {
          width = this.tableWidth - (this.showVerticalScrollBar ? this.scrollBarWidth : 0);
        }
//                    const width = this.bodyHeight === 0 ? this.tableWidth : this.tableWidth - this.scrollBarWidth;
        style.width = `${width}px`;
      }
      return style;
    },
    tableHeaderStyle() {
      let style = {};
      if (this.tableWidth !== 0) {
        let width = '';
        width = this.tableWidth;
        style.width = `${width}px`;
      }
      return style;
    },
    fixedTableStyle() {
      let style = {};
      let width = 0;
      this.leftFixedColumns.forEach((col) => {
        if (col.fixed && col.fixed === 'left') width += col._width;
      });
      style.width = `${width}px`;
      return style;
    },
    fixedRightTableStyle() {
      let style = {};
      let width = 0;
      this.rightFixedColumns.forEach((col) => {
        if (col.fixed && col.fixed === 'right') width += col._width;
      });
      // width += this.scrollBarWidth;
      style.width = `${width}px`;
      style.right = `${this.showVerticalScrollBar ? this.scrollBarWidth : 0}px`;
      return style;
    },
    fixedRightHeaderStyle() {
      let style = {};
      let width = 0;
      let height = this.headerHeight + 1;
      if (this.showVerticalScrollBar) {
        width = this.scrollBarWidth;
      }
      style.width = `${width}px`;
      style.height = `${height}px`;
      return style;
    },
    bodyStyle() {
      let style = {};
      if (this.bodyHeight !== 0) {
        const height = this.bodyHeight;
        style.height = `${height}px`;
      }
      return style;
    },
    fixedBodyStyle() {
      let style = {};
      if (this.bodyHeight !== 0) {
        let height = this.bodyHeight - (this.showHorizontalScrollBar ? this.scrollBarWidth : 0);
        style.height = this.showHorizontalScrollBar ? `${height}px` : `${height - 1}px`;
      }
      return style;
    },
    leftFixedColumns() {
      return convertColumnOrder(this.cloneColumns, 'left');
    },
    rightFixedColumns() {
      return convertColumnOrder(this.cloneColumns, 'right');
    },
    isLeftFixed() {
      return this.columns.some(col => col.fixed && col.fixed === 'left');
    },
    isRightFixed() {
      return this.columns.some(col => col.fixed && col.fixed === 'right');
    }
  },
  methods: {
    rowClsName(index) {
      return this.rowClassName(this.data[index], index);
    },
    handleResize() {
      // let tableWidth = parseInt(getStyle(this.$el, 'width')) - 1;
      let tableWidth = this.$el.offsetWidth - 1;
      let columnsWidth = {};
      let sumMinWidth = 0;
      let hasWidthColumns = [];
      let noWidthColumns = [];
      let maxWidthColumns = [];
      let noMaxWidthColumns = [];
      this.cloneColumns.forEach((col) => {
        if (col.width) {
          hasWidthColumns.push(col);
        } else {
          noWidthColumns.push(col);
          if (col.minWidth) {
            sumMinWidth += col.minWidth;
          }
          if (col.maxWidth) {
            maxWidthColumns.push(col);
          } else {
            noMaxWidthColumns.push(col);
          }
        }
        col._width = null;
      });

      let unUsableWidth = hasWidthColumns.map(cell => cell.width).reduce((a, b) => a + b, 0);
      let usableWidth = tableWidth - unUsableWidth - sumMinWidth - (this.showVerticalScrollBar ? this.scrollBarWidth : 0) - 1;
      let usableLength = noWidthColumns.length;
      let columnWidth = 0;
      if (usableWidth > 0 && usableLength > 0) {
        columnWidth = parseInt(usableWidth / usableLength);
      }

      for (let i = 0; i < this.cloneColumns.length; i++) {
        const column = this.cloneColumns[i];
        let width = columnWidth + (column.minWidth ? column.minWidth : 0);
        if (column.width) {
          width = column.width;
        } else {
          if (column._width) {
            width = column._width;
          } else {
            if (column.minWidth > width) {
              width = column.minWidth;
            } else if (column.maxWidth < width) {
              width = column.maxWidth;
            }

            if (usableWidth > 0) {
              usableWidth -= width - (column.minWidth ? column.minWidth : 0);
              usableLength--;
              if (usableLength > 0) {
                columnWidth = parseInt(usableWidth / usableLength);
              } else {
                columnWidth = 0;
              }
            } else {
              columnWidth = 0;
            }
          }
        }

        column._width = width;

        columnsWidth[column._index] = {
          width: width
        };
      }
      if (usableWidth > 0) {
        usableLength = noMaxWidthColumns.length;
        columnWidth = parseInt(usableWidth / usableLength);
        for (let i = 0; i < noMaxWidthColumns.length; i++) {
          const column = noMaxWidthColumns[i];
          let width = column._width + columnWidth;
          if (usableLength > 1) {
            usableLength--;
            usableWidth -= columnWidth;
            columnWidth = parseInt(usableWidth / usableLength);
          } else {
            columnWidth = 0;
          }

          column._width = width;

          columnsWidth[column._index] = {
            width: width
          };
        }
      }

      this.tableWidth = this.cloneColumns.map(cell => cell._width).reduce((a, b) => a + b, 0) + (this.showVerticalScrollBar ? this.scrollBarWidth : 0) + 1;
      this.columnsWidth = columnsWidth;
      this.fixedHeader();
    },
    handleMouseIn(_index) {
      if (this.disabledHover) return;
      if (this.objData[_index]._isHover) return;
      this.objData[_index]._isHover = true;
    },
    handleMouseOut(_index) {
      if (this.disabledHover) return;
      this.objData[_index]._isHover = false;
    },
    // 通用处理 highlightCurrentRow 和 clearCurrentRow
    handleCurrentRow(type, _index) {
      let oldIndex = -1;
      for (let i in this.objData) {
        if (this.objData[i]._isHighlight) {
          oldIndex = parseInt(i);
          this.objData[i]._isHighlight = false;
        }
      }
      if (type === 'highlight') this.objData[_index]._isHighlight = true;
      const oldData = oldIndex < 0 ? null : JSON.parse(JSON.stringify(this.cloneData[oldIndex]));
      const newData = type === 'highlight' ? JSON.parse(JSON.stringify(this.cloneData[_index])) : null;
      this.$emit('on-current-change', newData, oldData);
    },
    highlightCurrentRow(_index) {
      if (!this.highlightRow || this.objData[_index]._isHighlight) return;
      this.handleCurrentRow('highlight', _index);
    },
    clearCurrentRow() {
      if (!this.highlightRow) return;
      this.handleCurrentRow('clear');
    },
    clickCurrentRow(_index) {
      this.highlightCurrentRow(_index);
      this.$emit('on-row-click', JSON.parse(JSON.stringify(this.cloneData[_index])), _index);
    },
    dblclickCurrentRow(_index) {
      this.highlightCurrentRow(_index);
      this.$emit('on-row-dblclick', JSON.parse(JSON.stringify(this.cloneData[_index])), _index);
    },
    getSelection() {
      let selectionIndexes = [];
      for (let i in this.objData) {
        if (this.objData[i]._isChecked) selectionIndexes.push(parseInt(i));
      }
      return JSON.parse(JSON.stringify(this.data.filter((data, index) => selectionIndexes.indexOf(index) > -1)));
    },
    toggleSelect(_index) {
      let data = {};

      for (let i in this.objData) {
        if (parseInt(i) === _index) {
          data = this.objData[i];
          break;
        }
      }
      const status = !data._isChecked;

      this.objData[_index]._isChecked = status;

      const selection = this.getSelection();
      this.$emit(status ? 'on-select' : 'on-select-cancel', selection, JSON.parse(JSON.stringify(this.data[_index])));
      this.$emit('on-selection-change', selection);
    },
    toggleExpand(_index) {
      let data = {};

      for (let i in this.objData) {
        if (parseInt(i) === _index) {
          data = this.objData[i];
          break;
        }
      }
      const status = !data._isExpanded;
      this.objData[_index]._isExpanded = status;
      this.$emit('on-expand', JSON.parse(JSON.stringify(this.cloneData[_index])), status);
    },
    selectAll(status) {
      // this.rebuildData.forEach((data) => {
      //     if(this.objData[data._index]._isDisabled){
      //         this.objData[data._index]._isChecked = false;
      //     }else{
      //         this.objData[data._index]._isChecked = status;
      //     }

      // });
      for (const data of this.rebuildData) {
        if (this.objData[data._index]._isDisabled) {
          continue;
        } else {
          this.objData[data._index]._isChecked = status;
        }
      }
      const selection = this.getSelection();
      if (status) {
        this.$emit('on-select-all', selection);
      }
      this.$emit('on-selection-change', selection);
    },
    fixedHeader() {
      if (this.height) {
        this.$nextTick(() => {
          const titleHeight = parseInt(getStyle(this.$refs.title, 'height')) || 0;
          const headerHeight = parseInt(getStyle(this.$refs.header, 'height')) || 0;
          const footerHeight = parseInt(getStyle(this.$refs.footer, 'height')) || 0;
          this.bodyHeight = this.height - titleHeight - headerHeight - footerHeight;
          this.$nextTick(() => this.fixedBody());
        });
      } else {
        this.bodyHeight = 0;
        this.$nextTick(() => this.fixedBody());
      }
    },
    fixedBody() {
      if (this.$refs.header) {
        this.headerWidth = this.$refs.header.children[0].offsetWidth;
        this.headerHeight = this.$refs.header.children[0].offsetHeight;
        // this.showHorizontalScrollBar = this.headerWidth>this.$refs.header.offsetWidth;
      }

      if (!this.$refs.tbody || !this.data || this.data.length === 0) {
        this.showVerticalScrollBar = false;
      } else {
        let bodyContentEl = this.$refs.tbody.$el;
        let bodyEl = bodyContentEl.parentElement;
        let bodyContentHeight = bodyContentEl.offsetHeight;
        let bodyHeight = bodyEl.offsetHeight;

        this.showHorizontalScrollBar = bodyEl.offsetWidth < bodyContentEl.offsetWidth + (this.showVerticalScrollBar ? this.scrollBarWidth : 0);
        this.showVerticalScrollBar = this.bodyHeight ? bodyHeight - (this.showHorizontalScrollBar ? this.scrollBarWidth : 0) < bodyContentHeight : false;

        if (this.showVerticalScrollBar) {
          bodyEl.classList.add(this.prefixCls + '-overflowY');
        } else {
          bodyEl.classList.remove(this.prefixCls + '-overflowY');
        }
        if (this.showHorizontalScrollBar) {
          bodyEl.classList.add(this.prefixCls + '-overflowX');
        } else {
          bodyEl.classList.remove(this.prefixCls + '-overflowX');
        }
      }
    },
    hideColumnFilter() {
      // eslint-disable-next-line no-return-assign
      this.cloneColumns.forEach((col) => col._filterVisible = false);
    },
    handleBodyScroll(event) {
      if (this.showHeader) this.$refs.header.scrollLeft = event.target.scrollLeft;
      if (this.isLeftFixed) this.$refs.fixedBody.scrollTop = event.target.scrollTop;
      if (this.isRightFixed) this.$refs.fixedRightBody.scrollTop = event.target.scrollTop;
      this.hideColumnFilter();
    },
    handleFixedMousewheel(event) {
      let deltaY = event.deltaY;
      if (!deltaY && event.detail) {
        deltaY = event.detail * 40;
      }
      if (!deltaY && event.wheelDeltaY) {
        deltaY = -event.wheelDeltaY;
      }
      if (!deltaY && event.wheelDelta) {
        deltaY = -event.wheelDelta;
      }
      if (!deltaY) return;
      const body = this.$refs.body;
      const currentScrollTop = body.scrollTop;
      if (deltaY < 0 && currentScrollTop !== 0) {
        event.preventDefault();
      }
      if (deltaY > 0 && body.scrollHeight - body.clientHeight > currentScrollTop) {
        event.preventDefault();
      }
      // body.scrollTop += deltaY;
      let step = 0;
      let timeId = setInterval(() => {
        step += 5;
        if (deltaY > 0) {
          body.scrollTop += 2;
        } else {
          body.scrollTop -= 2;
        }
        if (step >= Math.abs(deltaY)) {
          clearInterval(timeId);
        }
      }, 5);
    },
    handleMouseWheel(event) {
      const deltaX = event.deltaX;
      const $body = this.$refs.body;

      if (deltaX > 0) {
        $body.scrollLeft = $body.scrollLeft + 10;
      } else {
        $body.scrollLeft = $body.scrollLeft - 10;
      }
    },
    sortData(data, type, index) {
      const key = this.cloneColumns[index].key;
      data.sort((a, b) => {
        if (this.cloneColumns[index].sortMethod) {
          return this.cloneColumns[index].sortMethod(a[key], b[key], type);
        } else {
          if (type === 'asc') {
            return a[key] > b[key] ? 1 : -1;
          } else if (type === 'desc') {
            return a[key] < b[key] ? 1 : -1;
          }
        }
      });
      return data;
    },
    handleSort(_index, type) {
      const index = this.GetOriginalIndex(_index);
      // eslint-disable-next-line no-return-assign
      this.cloneColumns.forEach((col) => col._sortType = 'normal');

      const key = this.cloneColumns[index].key;
      if (this.cloneColumns[index].sortable !== 'custom') { // custom is for remote sort
        if (type === 'normal') {
          this.rebuildData = this.makeDataWithFilter();
        } else {
          this.rebuildData = this.sortData(this.rebuildData, type, index);
        }
      }
      this.cloneColumns[index]._sortType = type;

      this.$emit('on-sort-change', {
        column: JSON.parse(JSON.stringify(this.allColumns[this.cloneColumns[index]._index])),
        key: key,
        order: type
      });
    },
    handleFilterHide(index) { // clear checked that not filter now
      if (!this.cloneColumns[index]._isFiltered) this.cloneColumns[index]._filterChecked = [];
    },
    filterData(data, column) {
      return data.filter((row) => {
        // 如果定义了远程过滤方法则忽略此方法
        if (typeof column.filterRemote === 'function') return true;
        let status = !column._filterChecked.length;
        for (let i = 0; i < column._filterChecked.length; i++) {
          status = column.filterMethod(column._filterChecked[i], row);
          if (status) break;
        }
        return status;
      });
    },
    filterOtherData(data, index) {
      let column = this.cloneColumns[index];
      if (typeof column.filterRemote === 'function') {
        column.filterRemote.call(this.$parent, column._filterChecked, column.key, column);
      }
      this.cloneColumns.forEach((col, colIndex) => {
        if (colIndex !== index) {
          data = this.filterData(data, col);
        }
      });
      return data;
    },
    handleFilter(index) {
      const column = this.cloneColumns[index];
      let filterData = this.makeDataWithSort();

      // filter others first, after filter this column
      filterData = this.filterOtherData(filterData, index);
      this.rebuildData = this.filterData(filterData, column);

      this.cloneColumns[index]._isFiltered = true;
      this.cloneColumns[index]._filterVisible = false;
      this.$emit('on-filter-change', column);
    },
    /**
     * #2832
     * 应该区分当前表头的 column 是左固定还是右固定
     * 否则执行到 $parent 时，方法的 index 与 cloneColumns 的 index 是不对应的
     * 左固定和右固定，要区分对待
     * 所以，此方法用来获取正确的 index
     * */
    GetOriginalIndex(_index) {
      return this.cloneColumns.findIndex(item => item._index === _index);
    },
    handleFilterSelect(_index, value) {
      const index = this.GetOriginalIndex(_index);
      this.cloneColumns[index]._filterChecked = [value];
      this.handleFilter(index);
    },
    handleFilterReset(_index) {
      const index = this.GetOriginalIndex(_index);
      this.cloneColumns[index]._isFiltered = false;
      this.cloneColumns[index]._filterVisible = false;
      this.cloneColumns[index]._filterChecked = [];

      let filterData = this.makeDataWithSort();
      filterData = this.filterOtherData(filterData, index);
      this.rebuildData = filterData;
      this.$emit('on-filter-change', this.cloneColumns[index]);
    },
    makeData() {
      let data = deepCopy(this.data);
      data.forEach((row, index) => {
        row._index = index;
        row._rowKey = rowKey++;
      });
      return data;
    },
    makeDataWithSort() {
      let data = this.makeData();
      let sortType = 'normal';
      let sortIndex = -1;
      let isCustom = false;

      for (let i = 0; i < this.cloneColumns.length; i++) {
        if (this.cloneColumns[i]._sortType !== 'normal') {
          sortType = this.cloneColumns[i]._sortType;
          sortIndex = i;
          isCustom = this.cloneColumns[i].sortable === 'custom';
          break;
        }
      }
      if (sortType !== 'normal' && !isCustom) data = this.sortData(data, sortType, sortIndex);
      return data;
    },
    makeDataWithFilter() {
      let data = this.makeData();
      // eslint-disable-next-line no-return-assign
      this.cloneColumns.forEach(col => data = this.filterData(data, col));
      return data;
    },
    makeDataWithSortAndFilter() {
      let data = this.makeDataWithSort();
      // eslint-disable-next-line no-return-assign
      this.cloneColumns.forEach(col => data = this.filterData(data, col));
      return data;
    },
    makeObjData() {
      let data = {};
      this.data.forEach((row, index) => {
        const newRow = deepCopy(row);// todo 直接替换
        newRow._isHover = false;
        if (newRow._disabled) {
          newRow._isDisabled = newRow._disabled;
        } else {
          newRow._isDisabled = false;
        }
        if (newRow._checked) {
          newRow._isChecked = newRow._checked;
        } else {
          newRow._isChecked = false;
        }
        if (newRow._expanded) {
          newRow._isExpanded = newRow._expanded;
        } else {
          newRow._isExpanded = false;
        }
        if (newRow._highlight) {
          newRow._isHighlight = newRow._highlight;
        } else {
          newRow._isHighlight = false;
        }
        data[index] = newRow;
      });
      return data;
    },
    // 修改列，设置一个隐藏的 id，便于后面的多级表头寻找对应的列，否则找不到
    makeColumnsId(columns) {
      return columns.map(item => {
        if ('children' in item) item.children = this.makeColumnsId(item.children);
        item.__id = getRandomStr(6);
        return item;
      });
    },
    makeColumns(cols) {
      // 在 data 时，this.allColumns 暂时为 undefined
      let columns = deepCopy(getAllColumns(cols));
      let left = [];
      let right = [];
      let center = [];

      columns.forEach((column, index) => {
        column._index = index;
        column._columnKey = columnKey++;
        column._width = column.width ? column.width : ''; // update in handleResize()
        column._sortType = 'normal';
        column._filterVisible = false;
        column._isFiltered = false;
        column._filterChecked = [];

        if ('filterMultiple' in column) {
          column._filterMultiple = column.filterMultiple;
        } else {
          column._filterMultiple = true;
        }
        if ('filteredValue' in column) {
          column._filterChecked = column.filteredValue;
          column._isFiltered = true;
        }

        if ('sortType' in column) {
          column._sortType = column.sortType;
        }
        if (column.fixed && column.fixed === 'left') {
          left.push(column);
        } else if (column.fixed && column.fixed === 'right') {
          right.push(column);
        } else {
          center.push(column);
        }
      });
      return left.concat(center).concat(right);
    },
    // create a multiple table-head
    makeColumnRows(fixedType, cols) {
      return convertToRows(cols, fixedType);
    },
    exportCsv(params) {
      if (params.filename) {
        if (params.filename.indexOf('.csv') === -1) {
          params.filename += '.csv';
        }
      } else {
        params.filename = 'table.csv';
      }

      let columns = [];
      let datas = [];
      if (params.columns && params.data) {
        columns = params.columns;
        datas = params.data;
      } else {
        columns = this.allColumns;
        if (!('original' in params)) params.original = true;
        datas = params.original ? this.data : this.rebuildData;
      }

      let noHeader = false;
      if ('noHeader' in params) noHeader = params.noHeader;

      const data = Csv(columns, datas, params, noHeader);
      if (params.callback) params.callback(data);
      else ExportCsv.download(params.filename, data);
    }
  },
  created() {
    if (!this.context) this.currentContext = this.$parent;
    this.showSlotHeader = this.$slots.header !== undefined;
    this.showSlotFooter = this.$slots.footer !== undefined;
    this.rebuildData = this.makeDataWithSortAndFilter();
  },
  mounted() {
    this.handleResize();
    // eslint-disable-next-line no-return-assign
    this.$nextTick(() => this.ready = true);
    on(window, 'resize', this.handleResize);
    this.observer = elementResizeDetectorMaker();
    this.observer.listenTo(this.$el, this.handleResize);

    this.$on('on-visible-change', (val) => {
      if (val) {
        this.handleResize();
      }
    });
  },
  beforeDestroy() {
    off(window, 'resize', this.handleResize);
    this.observer.removeListener(this.$el, this.handleResize);
  },
  watch: {
    data: {
      handler() {
        const oldDataLen = this.rebuildData.length;
        this.objData = this.makeObjData();
        this.rebuildData = this.makeDataWithSortAndFilter();
        this.handleResize();
        if (!oldDataLen) {
          this.fixedHeader();
        }
        // here will trigger before clickCurrentRow, so use async
        setTimeout(() => {
          this.cloneData = deepCopy(this.data);
        }, 0);
      },
      deep: true
    },
    columns: {
      handler() {
        // todo 这里有性能问题，可能是左右固定计算属性影响的
        const colsWithId = this.makeColumnsId(this.columns);
        this.allColumns = getAllColumns(colsWithId);
        this.cloneColumns = this.makeColumns(colsWithId);

        this.columnRows = this.makeColumnRows(false, colsWithId);
        this.leftFixedColumnRows = this.makeColumnRows('left', colsWithId);
        this.rightFixedColumnRows = this.makeColumnRows('right', colsWithId);
        this.rebuildData = this.makeDataWithSortAndFilter();
        this.handleResize();
      },
      deep: true
    },
    height() {
      this.handleResize();
    },
    showHorizontalScrollBar() {
      this.handleResize();
    },
    showVerticalScrollBar() {
      this.handleResize();
    }
  }
};
</script>
